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  本文選題：烏倫古　切入點(diǎn)：火山巖　出處：《中國礦業(yè)大學(xué)》2015年碩士論文

【摘要】：本文以準(zhǔn)噶爾盆地北部烏倫古地區(qū)為研究區(qū),以石炭系火山巖為主要研究對象,利用巖石學(xué)和元素地球化學(xué)的方法,結(jié)合測井曲線和地震剖面參數(shù),系統(tǒng)探討了火山巖的巖石元素地球化學(xué)特征、構(gòu)造環(huán)境、旋回劃分以及小波分析處理元素地球化學(xué)數(shù)據(jù)在旋回識別方面等地質(zhì)問題。通過本文研究工作,主要取得如下認(rèn)識:(1)通過巖石薄片鑒定以及野外剖面資料,分析出研究區(qū)火山巖類型主要有:安山巖、火山角礫巖、火山角礫凝灰?guī)r、火山凝灰?guī)r(正�；鹕剿樾紟r類)與沉凝灰?guī)r和凝灰質(zhì)粉砂巖、凝灰質(zhì)泥巖。(2)通過元素地球化學(xué)分析,研究區(qū)原始巖石具有同源性,Pb富集和Nb虧損反映原巖部分來自地殼。根據(jù)構(gòu)造環(huán)境判別圖,判定研究區(qū)火成巖形成的構(gòu)造環(huán)境為火山島弧型構(gòu)造環(huán)境,并且在形成過程中,有地殼物質(zhì)混入巖漿源。(3)烏倫古地區(qū)石炭系火山巖巖相劃分為火山沉積相組、火山噴發(fā)相組等2相組,火山沉積相、溢流相、爆發(fā)相等3相,過渡亞相、噴發(fā)沉積亞相、上部亞相、下部亞相、熱碎屑流亞相、空落亞相等6亞相。(4)通過小波分析處理主成分地球化學(xué)數(shù)據(jù),劃分火山旋回及韻律,并結(jié)合巖石鑒定、測井?dāng)?shù)據(jù)和地球化學(xué)數(shù)據(jù),將研究區(qū)石炭系火山巖系的4個旋回和18個期次加以描述同時也驗(yàn)證了小波分析預(yù)測火成巖旋回和韻律的有效性。
[Abstract]:In this paper, taking the Ulungu area in the north of Junggar Basin as the study area, taking the Carboniferous volcanic rocks as the main research object, using the methods of petrology and elemental geochemistry, combining the log curves and seismic profile parameters, The geochemistry characteristics of volcanic rocks, tectonic environment, cycle division and the cycle identification of element geochemistry data by wavelet analysis are systematically discussed in this paper. The main results are as follows: (1) through the identification of thin sections of rocks and field profile data, it is found that the main types of volcanic rocks in the study area are: andesite, volcanic breccia, volcanic breccia, volcanic breccia, volcanic breccia, volcanic breccia, and volcanic breccia. Volcanic tuff (normal pyroclastic rock) and tuff and tuffaceous siltstone, tuffaceous mudstone, by element geochemical analysis, The primary rocks in the study area have the homology of Pb enrichment and NB depletion, which reflect that part of the primary rocks come from the crust. According to the tectonic environment discriminant diagram, the tectonic environment of igneous rocks in the study area is determined to be volcanic island arc tectonic environment, and during the process of formation, the tectonic environment of igneous rocks in the study area is determined. The lithofacies of Carboniferous volcanic rocks in the Wulungu area are divided into volcanic sedimentary facies, volcanic eruption facies, volcanic sedimentary facies, overflow facies, eruption equivalent 3 facies, transitional subfacies, eruption sedimentary subfacies, etc. The upper subfacies, the lower subfacies, the thermoclastic flow subfacies, the empty subfacies equal 6 subfacies. 4) the principal component geochemical data are processed by wavelet analysis, the volcanic cycles and rhythms are divided, and the rock identification, logging data and geochemical data are combined. The four cycles and 18 periods of Carboniferous volcanic rock series in the study area are described and the validity of wavelet analysis in predicting igneous rock cycles and rhythms is also verified.
【學(xué)位授予單位】：中國礦業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：P588.14;P595

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 黃玉龍;王璞s，

本文編號：1658110